Question about Canon Extender EF 2x II Lens Converter

1 Answer

Auto focus will not work with the 100-400mm 5.6

My 100-400mm lens will not auto focus when using with the Canon Extender EF2x. I was told you could cover one of the connections with a small piece of tape. Does anyone know which connection this is?

Posted by on

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that gotĀ 5 achievements.

    Vice President:

    An expert whose answer gotĀ voted for 100 times.

    Novelist:

    An expert who has written 50 answers of more than 400 characters.

  • Expert
  • 155 Answers

It's the same 3 as with the 1.4x, but be warned it is likely to be a very unsatisfactory solution in all but the very brightest daylight, and the lens will continually hunt for autofocus - you risk burning out your focussing motor.

If you really want to experiment, hold the converter so the writing on it is the correct way up. Looking at the row of gold pins, rotate the lens so they are at the top, or the 12 o'clock position. It is the 3 leftmost pins you want to cover. Use a piece of sellotape (scotch tape) to cover the three pins, you'll have to cut a thin strip to do it. Be careful as the tape could slip as you attach the converter to the lens adding more risk to the experiment if it gets stuck somewhere it shouldn't!

I tried this with my 2x (version 1) and a 70-200f4/L, it tries to focus but fails with the much reduced light. Might try it outside on a sunny day, but also scared of damaging my lens!

Posted on Feb 03, 2009

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Canon Rebel EOS Rebel Ti1 will not auto focus


The lens needs servicing, because the lens is stiff the auto focus motor cannot turn the lens to focus.

Mar 24, 2012 | Canon Digital Rebel EOS 450D EOS Rebel XSi...

1 Answer

Canon 40D will no longer work if on auto focus. Will only take a picture in manual focus.


When in auto focus does the lens try to focus?
Sounds like your lens is the problem, you can try to clean the gold contacts on both the camera and on the lens with a pencil eraser (Make sure not to get any eraser dust in either the camera or the lens). If you can try a different lens on your camera and see if that one will work.
Please post a comment if you need more help on this.

Jun 13, 2011 | Canon EOS 40D Digital Camera

1 Answer

My auto focus will not work.


lens af unit gear is broken, or lens af saft if broken, or lens af flex is broken.
or could be camera sub mirror spring is come out from mirror unit.
take it to canon repaire centre to estimate

Jul 05, 2010 | Canon EOS Rebel XSi Digital Camera

2 Answers

My canon rebel XSi will not auto focus


Actually what I found to solve the problem was to first set the lens in "MF" and practice taking a picture manually to see if that would work. When I did this, I discovered that the fine tuning portion of the lens was somehow stuck mechanically. I heard a loud click as I turned it. That was all it took to fix the focusing mechanism on the lens. Then I set to "AF" and Voila, the camera worked just fine.

Apr 04, 2010 | Canon EOS Rebel XSi Digital Camera

1 Answer

Need Help, the auto focus of my canon 400D won't work.(I can still shot with manual focus)


Try cleaning the contacts on the camera body and the lens where they meet with a cotton swab lightly dampened with rubbing alcohol.

Oct 14, 2009 | Canon EOS 400D / Rebel XTi Digital Camera...

1 Answer

Auto focus is not working properly and will not


You want to charge people for a membership to get answers from your site
but you want me to "tell you how I did it" for free. Hmmmmmm?

Sep 09, 2009 | Canon Digital Rebel / EOS-300D Digital...

1 Answer

Auto focus not working


The lens AF mode is not working. What lens is it you are using?

It is not a camera issue but a lens issue. Try a different lens to be certain.

Jun 08, 2009 | Canon EOS 40D Digital Camera

1 Answer

Auto focus on Canon Rebel XT 350D


Move the switch on the lens from MF to AF.

The auto focus setting is in he lens and not the camera body

Jul 07, 2008 | Canon Rebel XT / EOS 350D Digital Camera

1 Answer

Automatic focus


I still don't have a digital SLR camera, but on the old Cannon film SLRs, the focusing motor is within the lense itself. The extender should have contacts to transmit the signals from the body to the lense. Visually inspect the extender, otherwise you'll be forced to go manual.

Apr 15, 2008 | Cameras

1 Answer

Tamron lens for Xti?


if it is an auto focus lens that works on one eos camera, it should work on almost all of them. the only known exception is that some high end extenders will not fit the eos1dmarkII as it protrudes into the opening too far.
but a good rule is that if it fits without any obstruction issues, it should work. try cleaning contacts on the lens and camera body. if that doesn't fix it, talk to Tamron. you can use it manually, but will not be as easy and you would get less predictable results.

my suggestion is to always go with lens from camera maker.

sounds like there is an issue with the tamron lens. not the camera.
good luck
mark

Dec 16, 2007 | Canon EOS 400D / Rebel XTi Digital Camera...

Not finding what you are looking for?
Canon Extender EF 2x II Lens Converter Logo

Related Topics:

254 people viewed this question

Ask a Question

Usually answered in minutes!

Top Canon Cameras Experts

kakima

Level 3 Expert

101554 Answers

TC CAMERA REPAIR.Com...

Level 2 Expert

165 Answers

old marine
old marine

Level 3 Expert

1709 Answers

Are you a Canon Camera Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...